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CNF-metal compound independent electrode material and preparation method and application thereof

A metal compound, independent electrode technology, applied in active material electrodes, nanotechnology for materials and surface science, negative electrodes, etc. The effect of increasing the length, reducing the high current discharge and alleviating the volume expansion

Inactive Publication Date: 2019-11-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal oxide / sulfur / selenide-based electrodes are greatly hindered in practical applications due to their poor electrical conductivity and the large volume change during charge-discharge.

Method used

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  • CNF-metal compound independent electrode material and preparation method and application thereof
  • CNF-metal compound independent electrode material and preparation method and application thereof
  • CNF-metal compound independent electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) 1g cobalt acetate (Co(Ac) 2 4H 2 O) and 2g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) Dissolve in 15g dimethylformamide (DMF), add 2.2g polyacrylonitrile (PAN) powder after dissolving completely, stir for 24h, obtain polyacrylonitrile solid content and be the homogeneous mixed spinning solution of 11%.

[0035] (2) Put the mixed spinning solution in a 10ml syringe, use a 20G stainless steel needle, set the spinning parameters: advance speed 1ml / h, voltage 14kV, spinning distance 20cm, use aluminum foil to receive; Dry in an oven at 60°C to obtain a PAN-metal salt nonwoven fabric, which is a blended fiber of metal salt and polymer.

[0036] (3) 4g terephthalic acid is dissolved in 300ml methanol to form a solution with a concentration of 0.15mol / L, and the PAN-metal salt nonwoven fabric obtained in step (2) is soaked in it for 24h, due to cobalt ions, nickel ions and The coordination of terephthalic acid can form a layer of MOF on the surface of the fiber. After takin...

Embodiment 2

[0042] (1) 2.3g cobalt acetate (Co(Ac) 2 4H 2 O) and 1 g zinc acetate (Zn(Ac) 2 2H 2 O) Dissolve in 30g dimethylformamide (DMF), add 3.3g polyacrylonitrile (PAN) powder after completely dissolving, stir in 60 ℃ oil bath for 24h, obtain polyacrylonitrile solid content is 9% homogeneous Mixed spinning solution.

[0043] (2) Put the mixed spinning solution in a 10ml syringe, use a 20G stainless steel needle, set spinning parameters: advance speed 0.6ml / h, voltage 15kV, spinning distance 20cm, use aluminum foil to receive. After spinning, take it off and dry it in an oven at 60°C to obtain a PAN-metal salt nonwoven fabric, which is a metal salt and polymer blended fiber.

[0044] (3) 3g dimethylimidazole is dissolved in 100ml methanol and form concentration is the solution of 0.05mol / L, the PAN-metal salt non-woven fabric that step (2) obtains is immersed in wherein 4h, because cobalt ion, zinc ion and The coordination of dimethylimidazole can form a layer of MOF on the surfa...

Embodiment 3

[0051] (1) 2g cobalt acetate (Co(Ac) 2 4H 2 O) Dissolve in 15g of dimethylformamide (DMF), add 3g of polyacrylonitrile (PAN) powder after dissolving completely, stir in 60 ℃ oil bath for 24h, obtain polyacrylonitrile with solid content of 15% uniform mixing spinning solution.

[0052] (2) Put the mixed spinning solution in a 10ml syringe, use a 20G stainless steel needle, set spinning parameters: advance speed 0.3ml / h, voltage 13kV, spinning distance 22cm, use aluminum foil to receive. After spinning, take it off and dry it in an oven at 60°C to obtain a PAN-metal salt nonwoven fabric, which is a metal salt and polymer blended fiber.

[0053] (3) 10g of dimethylimidazole is dissolved in 200ml of methanol to form a solution with a concentration of 0.1mol / L, and the PAN-metal salt non-woven fabric obtained in step (2) is soaked in it for 24h, due to cobalt ions and dimethyl The coordination of imidazole can form a layer of MOF on the surface of the fiber. After taking it out,...

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a CNF-metal compound independent electrode material and preparation method and application thereof. The preparation method comprises the steps of dissolving a metal salt in dimethylformamide, adding polyacrylonitrile powder again, and performing uniform mixing to obtain a mixed spinning liquid; spinning under a high-voltageelectrostatic field to obtain polyacrylonitrile-metal salt composite non-woven fabric; immersing the polyacrylonitrile-metal salt composite non-woven fabric in a methanol solution of an organic ligand, uniformly forming a layer of organic metal framework material on a polyacrylonitrile fiber surface by a strong coordination effect of dissolved-out metal ions and the organic ligand so as to obtaina polyacrylonitrile-metal salt@organic metal framework; and placing the polyacrylonitrile-metal salt@organic metal framework in a tubular furnace, allowing the polyacrylonitrile to be pre-oxidized under 280 DEG C, performing high-temperature carbonization under a mixed atmosphere of hydrogen and argon, and finally, performing oxidization, vulcanization or selenylation to obtain the sheet-shaped CNF-metal compound independent electrode material. The CNF-metal compound independent electrode material is cut into an electrode plate and is directly used as a negative electrode in a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a CNF-metal compound independent electrode material and its preparation method and application. Background technique [0002] As a promising energy storage device, lithium-ion batteries have attracted extensive attention in recent years. At the same time, with the rapid development of new energy vehicles and smart portable devices, there is an urgent need for energy storage devices with higher reversible capacity and long cycle life. However, currently commercially available graphite electrodes have a low theoretical capacity (372mAhg -1 ), well below the specifications required for large-scale energy applications. Metal compound-based materials are promising active materials, which have been widely concerned by researchers. For example Co 3 o 4 The material could theoretically provide up to three times the capacity of conventional commercial graphite electrodes. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/131H01M4/136H01M4/48H01M4/525H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCH01M4/1391H01M4/1397H01M4/131H01M4/136H01M4/5815H01M4/581H01M4/483H01M4/525H01M4/628H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 蔡俊杰王凌志曹景茹陈妙玲张增耀
Owner GUANGDONG UNIV OF TECH
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